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Refer to sections one and two of this doc (Network and Disk) regarding how to diagnose which component is causing the condition.

The output of 'top' and 'iostat -x 1' will help give you an idea. (see below)

In the above example you can notice that all my CPU time is going to %wait (44.6%wa) and %idle (46.1%id) and my performance is slow.